Transcript Mid-Unit 1 Review

Mid-Unit 1 Review
1) Your school newspaper is conducting a survey
about music. Which survey question is least likely to
lead to biased results?
A) Do you listen to boring classical music?
B) What is your favorite type of music?
C) Do you agree that fun dance music should be played
at school dances instead of loud rock music?
D) Do you, like most people your age, watch music
videos?
E) Does the extreme cost of downloads keep you from
purchasing as much music as you would like?
B
2. At Rosa's summer job with a research company, she must get a
representative sample of people from her town to answer a
question about health habits. Which of the following methods
could be used to get a representative sample?
A) selecting people randomly from a computer list
B) gathering responses from women who own businesses in town
C) selecting people who are in the hospital
D) selecting every 10th person as they enter a fast-food restaurant
E) posting a survey to all her friends on Facebook
A
Match the sample of students with the correct
sampling method.
3)
A.
B.
C.
D.
E.
The first 40 students who enter the office
simple random
self - selected
systematic
convenience
stratified-random
4)
A.
B.
C.
D.
E.
Students selected using a computer number generator
simple random
self – selected
systematic
convenience
cluster
D
A
Match the sample of students with
the correct sampling method.
5)
A.
B.
C.
D.
E.
Mail a response card
simple random
self - selected
systematic
convenience
stratified-random
B
6. A restaurant owner wants to find out how
often people go out for dinner. He surveys 50
people as they leave the restaurant. Is the
sample representative or biased? Explain.
The sample is biased because they are surveying
people as they leave the restaurant, so they
obviously go out for dinner.
7. Jesse is the manager of a guitar shop. He recorded the
number of guitars sold each week for a period of 10
weeks. His data is shown in this table. What is the mean,
standard deviation, and variance? Are there any outliers?
Week
1
2
3
4
5
6
7
8
9
10
#
Guitars
Sold
10
16
21
16
19
13
17
20
10
27
Mean: 16.9
Standard Deviation: ≈ 4.9
Variance: ≈ 24.8
Outliers: 13 – 1.5(7) = 2.5
20 + 1.5(7) = 30.5
There are no outliers.
8. Using the following data set, list the mean,
median, mode, Q1, Q3, and interquartile range
(IQR). Sketch a box-and-whisker plot.
A random sample of pulse-rates from our class
activity:
58, 52, 61, 90, 72, 81, 72, 88, 115
Mean: 76. 5
Median: 72
Mode: 72
Q1 = 59.5
Q3 = 89
IQR = 89-59.5 = 29.5
9. Dr. Jones wants to see whether the gender of
members in a tribe in the Amazon plays any role
in the order in which they are served their
evening meal. Dr. Jones is going to conduct:
a) an experiment
b) a convenience sample
c) an observational study
d) a systematic sample
C